keys refactoring: removed separate UniversalKey, it is now a direct base of any real keys instead of deleted KeyInstance

src/commonTest/kotlin/KeysTest.kt

@@ -4,6 +4,8 @@ import kotlinx.coroutines.test.runTest
 import kotlinx.serialization.encodeToString
 import kotlinx.serialization.json.Json
 import net.sergeych.crypto2.*
+import net.sergeych.tools.bipack
+import net.sergeych.tools.biunpack
 import net.sergeych.utools.now
 import net.sergeych.utools.pack
 import net.sergeych.utools.unpack
@@ -187,9 +189,9 @@ class KeysTest {
         assertEquals(sy1, deepCopy(sy1), "symmetric key should be equal to the restored copy")
         assertEquals(sy1.hashCode(), deepCopy(sy1).hashCode(), "hashcode of the restored symmetric key is wrong")
 
-        val usy1 = UniversalKey.from(sy1)
-        val usy2 = UniversalKey.from(sy2)
-        val usy3 = UniversalKey.from(sy3)
+        val usy1 = sy1 as UniversalKey
+        val usy2 = sy2 as UniversalKey
+        val usy3 = sy3 as UniversalKey
 
         assertEquals(usy1, usy2)
         assertEquals(usy2, usy1)
@@ -203,10 +205,10 @@ class KeysTest {
         assertEquals(sk2, sk1)
         assertFalse { sk1 == sk3 }
 
-        var usk1 = UniversalKey.from(sk1)
-        var usk2 = UniversalKey.from(sk2)
-        var usk3 = UniversalKey.from(sk3)
-        val usk4 = UniversalKey.from(sy3)
+        var usk1 = sk1 as UniversalKey
+        var usk2 = sk2 as UniversalKey
+        var usk3 = sk3 as UniversalKey
+        val usk4 = sy3 as UniversalKey
 
         assertEquals(usk1, usk2)
         assertEquals(usk2, usk1)
@@ -223,7 +225,7 @@ class KeysTest {
         usk2 = deepCopy(usk2)
         usk3 = deepCopy(usk3)
 
-        assertEquals(usk1.hashCode(),usk2.hashCode())
+        assertEquals(usk1.hashCode(), usk2.hashCode())
 
         assertEquals(usk1, usk2)
         assertEquals(usk2, usk1)
@@ -239,4 +241,13 @@ class KeysTest {
         // usk1 and usk2 are equal so set with only one of should be the same
         assertEquals(a, setOf(usk1, usk3, usk4))
     }
+
+    @Test
+    fun testKiSerialization() = runTest {
+        initCrypto()
+        val k: UniversalKey = SymmetricKey.new()
+        val d = bipack(k)
+        val k1: UniversalKey = biunpack<UniversalKey>(d) as SymmetricKey
+        assertEquals(k, k1)
+    }
 }